Solid-state relays with brushless drivers?

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om_tech_support_JT
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Solid-state relays with brushless drivers?

Postby om_tech_support_JT » Fri Dec 21, 2012 6:14 pm

Q: In your brushless motor driver manual, you have the following statement,

"Do not use a solid-state relay (SSR) to turn on/off the power
A circuit that turns on/off the power via a solid-state relay (SSR) may damage the motor and driver."

Can you explain the reason behind this? How would it damage the motor and driver? My existing safety system / emergency stop design has limit switches which are hooked up to solid-state relays which control the power to the motor driver. I prefer to keep the same safety system design intact if I can.

A: We would suggest that you follow our manual's instructions to avoid using a solid-state relay to turn on/off power on our brushless motor drivers. We believe that leakage current within solid-state relays may cause shorts and damage the internal components such as the fuse and FETs (field-effect transistors). There could also be inrush current issues since the power supplied to the driver may turn on/off frequently by the solid-state relay due to the leakage current.

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